absence of microglia    bennett    boy    boy’s brain    boy’s case    boy’s dna    boy’s neurons    brain    cellular pathway    corpus callosum    corpus-callosum neurons    couple    cousins.in adults    csf1r. doctors    days-old infant    delicate balance    dense bundle of nerves    develop.in petri dishes    developmental neurobiologist    entire type of cell    expecting parents    faulty copies of the csf    genetic counselor    happy ending    hold of the mother    humans.kim green    james bennett    memory loss    microglia    mutant mice    neurons    own csf1r mutation    part of the brain    pediatric geneticist    phone numbers    r gene    rare mutation    result of mutations    right hemispheres    rural alaska    seattle children    single gene    son    son’s condition    stephen noctor    things    university of california    why.the answer    worried young parents    zebra-fish biologists